If you aspire to abseil Yosemite's dramatic Lost Arrow Spire, or to climb that lone detached pillar just off a favorite route, you'll have to make a leap of faith--or just use the petzl Tandem transport pulley to Tyrolean traverse with the best of them. This double pulley can accommodate ropes up to 13mm and features a wide, secure attachment point that can hold up to three carabiner. Slide your ropes through the sheaves--which are mounted on self-lubricated bushings for 71% efficiency--and zip across gaps at speeds of up to 10m/s. The Petzl Tandem can handle a working load of up to 10 kN, so it can easily guide you and your packs across chasms to your next destination--or make for one awesome backyard zipline.